CreateQuery cannot_be_nullable (children 3)
 Identifier cannot_be_nullable
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration n (children 1)
    DataType Int8
   ColumnDeclaration a (children 1)
    DataType Array (children 1)
     ExpressionList (children 1)
      DataType UInt8
 Storage definition (children 1)
  Function Memory